. >>> pope benedict has arrived at st. peters's square for his last public audience. this is a live picture where tens of thousands have gathered to see phone benedict on his last full day as lead over the catholic church. benedict is expected to speak for over an hour possibly laying out his vision for the future of the church. >>> in medical news now, a new study finds a worrisome trend. an incidence of deadly breast cancer among women has appeared. these cancers tend to be more aggressive. >> reporter: more women are being diagnosed with breast cancer at an early age. >> it's scary. definitely very scary but something to be aware of. >> reporter: a new study in the american journal of medicine finds a small but significant increase in advance breast cancer among women in their 20s and 30s. researchers have found it's gone up each year since 1976. >> ideally you want to see it go down, not up. >> reporter: young women with breast cancer tend to have more aggressive forms of the disease than older women and have lower survival rates. 230,000 women are diagnosed with